HELLO   am having trouble with my bedford mj, its not getting up to air pressure only reaching 3.5bar on both gauges and takes around 10-15 mins to get to that and drains in around 10 mins to 0. checked around the system and cant find any obvious leaks with soapy water anywhere. i can hear air escaping from the reservior internally but cant find where the air is going. any ideas or things to check for thanks paul